Identify the element for which electronic configuration in
Question:

Identify the element for which electronic configuration in $+3$ oxidation state is $[\mathrm{Ar}] 3 \mathrm{~d}^{5}:$

  1. $\mathrm{Ru}$

  2. $\mathrm{Mn}$

  3. $\mathrm{Co}$

  4. $\mathrm{Fe}$


Correct Option: , 4

Solution:

$\mathrm{Fe}^{3+}[\mathrm{Ar}] 3 \mathrm{~d}^{5}$

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